What Are The Characteristics Of Spark Plugs?

In spark plug standards, calorific value is usually used to characterize the thermal characteristics of the spark plug. The calorific value of the spark plug represents the balance ability of the spark plug insulator skirt to absorb and dissipate heat. The higher the calorific value. The stronger the balance between heat absorption and heat dissipation, the hot spark plug has a lower calorific value and the cold spark plug has a higher calorific value. Generally, engines with high power and large compression ratio use cold spark plugs with high calorific value; on the contrary, engines with low power and small compression ratio use hot spark plugs with low calorific value. Generally, the selection of spark plugs is determined by the factory through product shaping experiments and should not be replaced at will.